[Boatanchors] HARVEY WELLS TBS 50

[Gary Schafer]

Not quite sure what you are saying? But if you turn the drive way down the
final could go into self oscillation as there is no screen clamp tube in
that rig. You can not control the power out with the drive control. You use
it to set the grid drive to what it is supposed to be after peaking the
drive and oscillator tune.

73
Gary  K4FMX

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of k0ewu9 at juno.com
> Sent: Sunday, March 16, 2008 3:47 PM
> To: boatanchors at mailman.qth.net
> Subject: [Boatanchors] HARVEY WELLS TBS 50
> 
> DOES ANY OF THE AUGUST GROUP have much experience with this little beast?
> I spent a lot of time on one and am puzzeled by some things.
> with the drive at zero max ,plate current is shown- about 70 mils ,the
> output is about 40 watts into
> a 50 ohm dummy load.  Sounds like a parasitic to me?
> A previous owner had grounded every chassis part to each other with solid
> wire jumpers
> using lots of soldering paste flux. (still there)
> all of the paper caps in the mod section were leaky and were replaced.
> Could there be a driver/final parasitic involved?
> HELP!!
> JACK         K0EWU9 at juno.com
> _______________________________________________